UN 1076 — Phosgene
Placard: Toxic Gas. ERG Guide 125. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1076 is Phosgene, a Class 2 toxic/corrosive gas assigned to ERG Guide 125. It can create inhalation, corrosive contact, frostbite and cylinder-rupture hazards during leaks or fire exposure.
Hazard overview: UN 1076 presents toxic gas, corrosive vapor and pressure-container hazards. Released gas may collect in low or enclosed areas, while fire or heat can create toxic gases and cylinder failure risk.
Response guidance: For a UN 1076 incident, responders should confirm the product using shipping papers, cylinder markings, SDS and ERG Guide 125. Establish incident command, isolate the area, stay upwind, avoid vapor contact, use air monitoring when available and consult ERG Table 1 when applicable.
Firefighter training notes: Training for UN 1076 should emphasize toxic inhalation risk, corrosive vapor exposure, SCBA discipline, Table 1 protective actions and cylinder leak-control limitations. Common errors include relying on odor, entering low areas without monitoring, applying water to a reactive leak and selecting splash PPE without respiratory protection.
Regulatory context: Phosgene is regulated as a hazardous material for transportation and emergency response purposes. Cylinder, workplace exposure, storage, reporting and environmental requirements may vary by product, quantity and jurisdiction. Responders should verify current requirements through shipping papers, SDS, cylinder markings, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Phosgene should be stored in compatible containers or cylinders in a cool, dry, well-ventilated area with toxic/corrosive gas controls, leak detection where required and segregation from incompatible materials. Protect containers from heat, corrosion, impact, valve damage and unauthorized access.
UN 1076 Quick Details
Common Hazards of UN 1076
- TOXIC and/or CORROSIVE; may be fatal if inhaled.
- Vapors are extremely irritating and corrosive to eyes, skin and respiratory tissue.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or vapor suppression may be corrosive or environmentally hazardous.
- Vapors may collect in low or confined areas depending on product and release conditions.
- Containers may rupture or rocket when heated.
Chemical Identity & Physical Properties
Colorless gas or fuming liquid below 8°C with a pungent odor of newly mown hay or green corn at low concentrations. Highly toxic even at very low concentrations.
| Also known as | Carbonyl chlorideCarbon oxychlorideChloroformyl chlorideCarbonic dichloride |
| CAS Number | 75-44-5 |
| Appearance | Colorless gas or fuming liquid below 8°C with a pungent odor of newly mown hay or green corn at low concentrations. Highly toxic even at very low concentrations. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | 8.2°C (46.8°F) |
| Vapor Density | 3.4 (much heavier than air) |
| Water Reactivity | Reacts slowly with water forming hydrochloric acid and carbon dioxide; reaction accelerates with heat |
Fireground Response Guidance — UN 1076
Extinguishing Media
PPE Requirements
Positive-pressure SCBA is required for suspected toxic/corrosive gas exposure. Chemical-protective clothing should be selected using SDS, monitoring results, leak conditions and incident command; Level A may be needed for close entry into unknown or high-concentration vapor.
Isolation & Evacuation
First Actions for a UN 1076 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Do not touch damaged cylinders, tanks, valves or released material unless properly trained and equipped.
- Avoid breathing gas, vapor, mist or fire gases.
- Many toxic or liquefied gases may spread along the ground and collect in low or confined areas.
- Ventilate closed spaces before entering, but only if properly trained, equipped and authorized by incident command.
- Isolate the spill or leak area for at least 100 meters (330 feet) in all directions.
- For highlighted materials, consult ERG Table 1 for Initial Isolation and Protective Action Distances.
- For non-highlighted materials, increase the precautionary distance downwind based on release size, weather, monitoring and incident command.
📋 Copy & Share Field Card
UN 1076 — PhosgeneUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.